Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4314784cca14e80…

MALICIOUS

PDF

71.2 KB Created: 2021-10-10 01:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 43d5d217a313e1acfe7adc6812fa2c01 SHA-1: 9d6f6baac2ffb8b3550e4fdf30bea8fbe46f31e7 SHA-256: b4314784cca14e8059d852a8434e0cedba74b1a8db3237156657f9f23344fae3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate structure designed to host many links on disposable domains. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.fdconsult.qa/public/uploads/cms_files/vadoriduvek.pdf In PDF document text
    • http://openendrep.com/userfiles/files/38319347897.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/zajawupigovinexabopolel.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/mozowujejudejusawixod.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/62846226034.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/xorifoz.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/3771214923.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/23661469068.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615283f79f16b---1564410548.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/dafuxemifote.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/57261559612.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/gasuvufomofovaf.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/68195297183.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/70537166873.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/60768194615.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/84601842405.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/48119963109.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/27415575344.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/mulemo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614db210b095b---nediramimasoniw.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/zulebowunap.pdfIn PDF document text
    • https://music-group-store.com/upload/files/22681817179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fawning+over+youPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 17788 bytes
SHA-256: 71b25ac25775cef0a3ff6fb58fdfd41418dec00a345d0c84b969199966c011fe
font_01_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 10316 bytes
SHA-256: e3fc0bf842118875b47882ab860422b6c77b2569760e54ff1222bb98a541bee9
font_02_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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